Investor · SEATTLE, WA

Mark Nelson

Open Mark in the network graph →

Filings

8

SEC Form D

Connections

35

co-filers

Capital

$7.1M

across filings

Active

Jan 2023

to Dec 2025

Most-connected co-filers (35)

Julio Peguero · SEATTLE, WA8 shared Jens H. Hoellermann · Luxembourg, Luxembourg4 shared John R. Hass · New York, NY4 shared John J. Althoff · Wellesley, MA2 shared Oleg Nodelman · San Francisco, CA2 shared Trisha Millican · San Diego, CA2 shared David S. Lockhart · Menlo Park, CA2 shared Edward S. Hurwitz · Menlo Park, CA2 shared William Blair Mb Investments GP, L.L.C · CHICAGO, IL2 shared Darrach Mccarthy · Santa Monica, CA2 shared Americo Cascella · Dallas, TX2 shared Jake Van · Fort Collins, CO2 shared Larry Fernandez · Los Angeles, CA2 shared Shehnaaz S. Suliman · Menlo Park, CA2 shared Rakhshita S. Dhar · Menlo Park, CA2 shared Kirsten Olsen · Chicago, IL2 shared Ron Carozza · SEATTLE, WA2 shared Ryan J. Anderson · Los Angeles, CA2 shared Grant J. Shaffer · Los Angeles, CA2 shared Robert W. Haydon · Phoenix, AZ2 shared Rana S. Al-Hallaq · Menlo Park, CA2 shared Helen S. Kim · New York, NY2 shared Alan Colowick · San Diego, CA2 shared Peter Thompson · New York, NY2 shared

Recent filings (8)

William Blair MB Investments, L.P. - OC 2025 SeriesDec 2025 · 5 co-filers P1 Trials, Inc.Dec 2025 · 12 co-filers$5.5M P1 Trials, Inc.Dec 2025 · 12 co-filers$5.5M P1 Trials, Inc.Jun 2025 · 10 co-filers$4.0M P1 Trials, Inc.Jun 2025 · 10 co-filers$4.0M William Blair MB Investments, L.P. - WD SeriesJan 2025 · 5 co-filers RECODE THERAPEUTICS, INC.Sep 2023 · 25 co-filers$290.0M Kupono Capital, LLCFeb 2023 · 11 co-filers$131.4M Kupono Capital, LLCFeb 2023 · 11 co-filers$142.4M RECODE THERAPEUTICS, INC.Jan 2023 · 23 co-filers$220.8M

Derived from public SEC Form D (Reg D) filings; entities resolved probabilistically. See Mark in the interactive graph →